Method of making banding for spinning-machines



'tion to the tar.

UNITED STATES PATENT OFFICE.

THOMAS H. DU NHAM, OF BOSTON, MASSACHUSETTS.

METHOD OF MAKING BANDING FOR SPINNING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 384,138, dated June 5,1888.

' Application filed August 11, 1887. Serial No. 246,746. (No model.)

To all whom it may concern.-

Be it known that I, THOMAS H. DUNHAM, a resident of Boston, in thecounty of Suffolk and State of Massachusetts, have invented a new anduseful Improvementin the Method of MakingBanding for Spinning-Machines,of which the following is a specification.

The object of my invention is to make a banding from cotton,water-proof, uniform in draft, and not liable to shrink.

To carry my invention into effect, I take a slack-twisted roving ofcotton,which is termed a slubber, the process of making which is fullyset forth and described in Letters Patent issued to me May 25, 1880, No.227,885, for a process of making rope-yarns from cotton, in lines 15 to30, inclusive of said patent. I twist the slubber very soft, giving suchnumber of turns to the inch as may be necessary according to the sizeused, but preferably to the number of three turns to the inch, twistingto the left. I then take two compound slnbbers, twisted as abovedescribed, and twist them very soft together, giving such number ofturns to the inch as may be necessary according to the size used,butpreferably to the number of two turns to'the inch, twisting to the left.I then pass the slubbers thus twisted through a bath of hot tar, in away well known to all skilled in the art of rope-making, and overdriers, all of which is well known. It will be advisable to add to thistar-bath an extract of some tanning substance-such as fustie, turmeric,oak bark, and gambierfirst boiling one of these substances-as, forexample, fustic-in water until its tanning and coloring properties havebeen extracted, using very little water in proportion to the amount offustic used, in order that the extract may be made very strong, thenmixing this extract with boiling tar in the proportion of one part inbulk of extract to three parts of tar. The fibers are firmly attachedtogether and made water-proof by the tar, and with no tendency to kinkor untwist, and in case the tanning-extract is added to the bath thefibers are strengthened and preserved by it in addi- The addition of thetanningextract to the tar-bath is not necessary, but is desirable. Ithen take two slubbers, after he ing twisted and tarred, as abovedescribed, and twist them together very soft, giving such number ofturns to the inch as may be necessary according to the size used, butpreferably to the number of two turns to the inch, twisting to theright.

The size of the slubbers twisted together vary according to the size ofbanding desired. The fibers of the cotton are set by the tar, so thatthe stretch is taken out of the banding when made, and it will notshrink or give in dry or damp weather.

I have practically demonstrated that the bandingdescribed is much betterthan the banding now used, in that it does not require to be laced sotight as dry banding, while it carries the work withoutslipping,givingmore power as well as more uniformity in draft, by which a steady speedis secured as well as greater draft with less power. The wear isuniform, as all the fibers are bound together. The size of the bandingis one third less than the usual sizes, showing the solid compact natureof the banding, and yet being soft and supple. In fastening the banding,there is no slipping of the knots, while there is no tightening orloosing of the bands required when once put in running order. Thebanding becomes more like wire in steadiness of draft as well as instrength, and yet is very durable and elastic.

W'hat I claim as my invention is The method of making banding fromcotton, which consists in softly twisting to the left a slubber ofcotton, and then softly twisting two or more slubbers together, twistingto the left, then passing such compound slubbers so twisted through abath of tar, and drying as described, then softly twisting together twoor

